If your trailer starts to whip or swerve, what should you do first?

When a trailer begins to whip or swerve, the first and most effective action is to slow down gradually by easing off the accelerator. This helps to reduce the speed of both the towing vehicle and the trailer, which decreases the instability that is causing the swaying motion. By reducing speed, the trailer is more likely to come back under control as the speed differential between the two vehicles decreases.

Turning sharply is often counterproductive in such situations, as it can lead to a loss of control and exacerbate the swaying. Quick acceleration can further destabilize the trailer, making matters worse by increasing momentum. Likewise, attempting to navigate in the opposite direction could complicate the situation and increase the chance of a rollover or collision. Thus, easing off the accelerator is the most prudent first step when addressing trailer sway.